The ads are insane. Want to save your progress (even in games with built in save mechanics in the original cart)? You have to watch an ad. Want to progress to the next level? Watch an ad. Want to progress past an in-level save point? Watch an ad.

It completely removes the player from the game and makes it tedious to play. I mean, I guess I'm happy they are releasing these at all, but they need to come up with a better way to serve ads that doesn't defeat the purpose of the game itself (quick bouts of fun).